Control means for drive mechanism



C. W. ANDERSON.

CONTROL MEANS FOR DRIVE MECHANISM. APPucArloN man MAYzs, 1919.

UNITED STATES vPA'IISN'I OFFICBfl CHARLES w. ANDERSON, orrBnooKtYN,Nnwyonx.

T o all whom it may concern.' s y Be it known that I, CHARLES W. ANDER-soN, residingat Brooklyn, in the county of Kings and State of New York,have invented certain new and useful Improvements 1n Control Means forDrive Mechanism, of

which the following is a specification.

.and in which I have shown merely a ferred form of embodiment of the`invention This invention relates toa foot power control means for drivemechanism, and isparticularly adapted for use" in connectionwith drivemechanism forl lood-elevatorsD and the like, such as is'illustrated anddescribed in my pending application Serial No. 161,344,

led April 11, 1917. Y

of the present inven-y 1 A particular object tion is to provide a powercontrol means employing `a slack `belt f with a tightener therefor, andwith a foot lever so disposed as to conveniently operate thebelt-tightenerA atfwill. y f Y Other objects and aimsof the invention,more or less specific than those referred to above, will be in partVobvious and in part pointed out in the course of the followlngAdescription of lthe elements, combinations,

arrangements of parts and 'applications of principles, constituting'the' invention, and the scope of protection contemplated will` beindicated in the appended claims.

In4 the accompanying drawings which are to be taken as apart of thisspecification,

Figure 1 is av side elevational view, partly in section, of a powercontrol means constructed in accordance` Awith this invention, and Y fFig. 2 is a front elevationalview, 1partly in section, of thestructureshown in Referring-to the drawingsfor describing in detail the structurewhlch is' illustrated therein, the reference character L indicatesamotor having a vshaft 1 and a vdrive pulle 2. f VyThe referencecharacter G indicates a shaft carrying a pinion 3, for engaging thedrive gear 4 of a hod elevator or the like, said shaft G also carrying apulley 5 to be driven from the pulley 2. l Y A j A slack belt H extendsbetween the pulleys 2and5.;V Y j .l g

The beltftightener includes a body mem ber 6 whichfis mounted to-oscillate upon hang below said shaft 7'.v At its lower endv CONTROLMEANSFOR nmvn MECHANISM.

Patented Aug. 16, 1921. v

1919. Sei'itlvNo. 300,304. 1 l

the body member 6 is provided with a belttightening roller 8 which ismounted upon a -pin 9 extending-between spaced arms 10 of said member 6.Y l l Normally the roller 8 hangs free of .the belt H. Y

- Due to the slackness of the belt nol `motion istransmittedgfrom thepulley `2 to the 'pulley mexcept whenthe rollerV 8 isY pressing againstthe belt. v

Any suitable vmeans may be employedfor retaining thev belttightener intightening position when desired. VExamples of such means. areillustrated in my copending applications ,SerialNo 161,343, SerialNo.'161, 344, and Serial No. A-105, the latter illustrating a clutchmechanism; similar to that shown in Fig. 2'herein.- In'said `Fig.'2 thebody member 6 is provided with a clutch member 11 at one sidethereof,concentric with the shaft, the outer face of the clutch v memberbeingV formed withsuitable ratchet teeth v12 thereon. cooperating clutchmember 13 is mounted upon the shaft 7 to slide longitudinally thereon'toward:k and away from the clutch member 11, theopterposed between'thefclutch member 13 and the oppo'sing'face ofthe adjacent support 18 oftheshaft 7 adapted to urge thev clutch ymember 13 at all times-toward andinto engavement withlthe clutch-member4 11. f

ig. 1. l

l moving the clutch member '13 -against 'the' ny desired means maybeemployed for pressure of the spring 17, as' occasionV may `require, anexample of such means being illustratedherein, and conforming in prin-Aciple to the structure disclosed inthe copending application Serial No.161,344. It includes a small arm 19 pivotallyfmounted at one end of theshaft 7, and beingl connected by a link `20 with-,the lpin vl1,5, `saidlink 20 being extendedl longitudinally-of the shaft 7 through a centralbore formed in said shaft to 'receive it'. 'The arm 19 car-l -priesachain, or link, 21 whichextends into connection with an automaticcontrol lever 22 by which the arm maybe automatically swung'to pxullVback the clutch-.member .13 whenever t e control lever 22 is lifted.

When the roller 8 is in belt-tightening position, and the clutch members11 andA 1.3v are in engagement with each other,`said' clutch memberspositively retain the roller 8" in engagement with the belt until theclutch member 13 is drawn backwardly. y As soonas the clutchv member isdrawn backwardly, however, the roller willi' immediately falli away fromthe belt and the driving connection' between the pulleys 2" and 5 willbe broken". 'lhen driving' connection willv re-` mainbroken until theroller is2 againy swung into tightening position.

The foot lever 2B is mountedfand' connected with the belt-tightener soas to swing the* belt-tightener manually into tightening position atwill. It may be made up in any suitable form, but is preferablyshapedfrom a single rod bent to provide a pivot portion- 24, an:operating end portion 25 at one sideof the pivot, andi a foot treadleportion 26 at theI other sible ofthe pivot'. The end of the portion 25-isbent tol form an engaging lug 27 projectinginto a slot 28 which isformed throughone of the arms' 10 of the body member' 6'. All of theparts are carrriecl by" orwithin asuitable frame, orV cas ing, 29i andithe pivot portion 24 isi mountedi within ay bearing 3@` formed withinacross member' ofY said frame", the foot tre'ad'l'e portion 26Vextending eirteriorlyl of theI frame intel a positionI` of readyaccessibility.

A tension springv32- en'gggages between the portion 25 of' the footlever andiv a portion of the frame for normally urging thebelttivfhtener' into non-tightening position.

QIt will be' particularly noted that the relative` position of the axesof rotation of the belt-tightenei"andil the foot lever is such that asthe roller 8- nears its tighteningposition, a desirable degree of cam,or wedge action,

of gradually increasing force, takes place between thel lug 2T and theopposing'walf of the slot 28,` thusI enabling a desired amount oflpressurek to beapplied against the ,roller withoutI undue exertion` on`the part ofthe opera-tor: This wedge, or cam,v` acti-onv ifscl'earlyfindilcated by thedotted lines in Fig. 1i from which; it willlhe seen that-the farther the lu, f=2"7'- swings to the lett, the moreynearly itsA path of. travel? approaches a straight line indicating thelongitudinal airis ofth'eslot` ltl will be noted', further, that-theportion 25 of the lever stands at all timesto oppose movement-onedirection ofthe body member 6E longitudinally along the shaft 7. Thebody member o'ibeing otherwise free toi move alongthelength of the shaft7, the portion 25 of the lever serves to retain' the roller 8 in propel"cooperativealinement with: the belt. At the same' time,v it serves toretain the clutch member 151 against movement with the clutch member 133whenrattempt is made to Ydrawer' the @hitch `member 13? away from theclutch member 11.

pivot. "ff

Als many changes could be made in this `construction withoutdepartingfrom theV scope ofl the invention as defined in the followingclaimar-itis intended that all matter contained in the abovedescription-or shown v4in theaccompanying drawings, shall be interpretedas illustrative only and not in a limiting sensei Having thusdescribed'my invention, what vl claim as new anddesire'to` secure byLettersjPatent isf- '1., 'Thefcombinationlivith a. drive pulley, adriven pulley,` a slacll belt extending between said pulleys, abelttightener movable f intoV and outA of beltetightening position, anda frame for supporting all of said parts, of

a footlever 'pivotally' supportedv by said` fra-me, being connectedtojswing'saidbelttightenerfinto tigl'itening position atwi-ll,

and having a foottreaelle portion extending to "afpositiony jofaccessibility beyond vsaiil frame.

2. The combination with ad-rive pulley, a

d-riven pulley, a slack belt extending .be-

`ferent `paths and engagingv together to Vafford? afwedge Aaction ofthecontrol means against the*belt`ti-g ;l1tener.`

8"', `The combinationwith a drive pulley, a

driven"` pulley,v a slfael belt *extendiiflgl `between saidi pulleys,andI a ,belt-tightener for said e belt, said beltltightener' comprising'a pivotallymoun-tedf body member"l'iavi-ngl anextending-portionarranged' to swing into and out of'tightening positionagainst the belt, of anfoperating member for the belttightenensaidoperating y'member being pivotally" mounted eccentrically of the:belttightener` and having a portion removed2 lattending portion ofV thebody 'member whereby to swing the body member about its The combinationwith adrive pulleyl a driven pulley, a entre belt extendingbetweenfsaicly pulleys, a belt-ti-glitener movable into and out' Iofbelt-,tightening position, and

` afpivotal support v:for the belt-tightener upon ioo orally fromitspivotand engaging the exwhich the belt tightener is loosely mounted, l

of an operatingelement for swinging the belt-tiglfitener about itspi-vot, saidi operating element comprising a part 'standing' to obstructmovement of the belt-tightener along its pivotal support.-`

. 55 The combination with a `drive pulley, a"

driveny Pulley, ,2L ,Slack belt extendmg be' `tween said pulleys, avbelt-tightener movable into and out of belt-tightening position, aprvota'l "supporti for the "belt-tightener yupon 4 whichl thebelt-tightener is loosely-mounted, f and a 'clutch for retaining thebelt-tightener the belt-tightener about its pivot, said operatingelement Comprising a part standing to obstruct movement of thebelt-tightenery alon its pivotal support. y

6. he combination with a drive pulley, a driven pulley, a slack beltextending between said pulleys, a belt tightener for said belt, and apivotal support for said belt tightener, said belt tightener comprisinga body member pivotally mounted upon said support and having anextending ortion arranged t0 swing into and out of tightening positionagainst the belt, Said extending portion having a slot therein extendinglongitudinally thereof, of an operating member by which manually toswing the belt tightener, Said operating member comprising a pivot partby Which it is pivotally supported and comprising another part extendingradially i'from the pivot part and engaging Within said slot, and abearing for Vthe pivot part of said operating member at one side of thepivot of the belt tightener. In'testimony whereof I aiiix my signaturein the presence of two Witnesses.

CHAS. W. ANDERSON. lVitnesses 1 L, Gnssronn HANDY, E. W. HAVILAND.

